netdev - [PATCH] memset skb to zero to avoid uninit value error from KMSAN

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Message-ID: <20251207162109.113159-1-tayyabfarooq1997@outlook.com>
Date: Mon,  8 Dec 2025 00:20:52 +0800
From: Syed Tayyab Farooq <syedtayyabfarooq08@...il.com>
To: netdev@...r.kernel.org
Cc: syzbot+0e665e4b99cb925286a0@...kaller.appspotmail.com,
	syedtayyabfarooq08@...il.com,
	Syed Tayyab Farooq <tayyabfarooq1997@...look.com>
Subject: [PATCH] memset skb to zero to avoid uninit value error from KMSAN

Signed-off-by: Syed Tayyab Farooq <tayyabfarooq1997@...look.com>
---

Hi syzbot,

Please test this patch.

#syz test: https://syzkaller.appspot.com/bug?extid=0e665e4b99cb925286a0

Thanks,
Tayyab


 net/phonet/af_phonet.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/phonet/af_phonet.c b/net/phonet/af_phonet.c
index a27efa4faa4e..9279decd680b 100644
--- a/net/phonet/af_phonet.c
+++ b/net/phonet/af_phonet.c
@@ -208,6 +208,8 @@ static int pn_raw_send(const void *data, int len, struct net_device *dev,
 	if (skb == NULL)
 		return -ENOMEM;
 
+	memset(skb, 0, MAX_PHONET_HEADER + len);
+
 	if (phonet_address_lookup(dev_net(dev), pn_addr(dst)) == 0)
 		skb->pkt_type = PACKET_LOOPBACK;
 
-- 
2.43.0